Digital video frequency recording equipment

Abstract

To obtain a digital recorder in which noise appearing in a reproduced sound is suppressed when audio encoding conditions (stereo / monoral) are altered. The digital recorder comprises a video encoding means , an audio mode decision means , an audio encoding means , a system encoding means for multiplexing an encoded video / audio, and a recording control means 105. When audio information is varied, the recording control means varies the audio encode mode after lowering the audio output level gradually and then increases the audio output level gradually again.

Description

technical field [0001] The present invention relates to an audio encoding control technique used when an audio encoding condition of a digital video recording apparatus that digitally encodes a video signal and an audio signal changes. Background technique [0002] In recent years, with the expansion of the storage capacity of optical disks or hard disks, digital video recording apparatuses that digitally encode and store video signals and audio signals have come into practical use. [0003] Audio signals can be classified into stereo (two channels), monaural (monaural) and multiplexed (primary voice: one channel + secondary voice: one channel) sound signals. Also, in the Dolby AC-3 or Linear PCM standard, there are 5.1 channels of audio signals. In the digital audio stream, the picture / sound recording time can be controlled, or the sound quality at the time of reproduction can be controlled by changing the encoding bit rate. [0004] Figure 4 Shows changes in audio outpu...

AI Technical Summary

Problems solved by technology

There are no measures taken against this noise in the prior art

Images